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Finding the Fourth Proportional to 742.83, 1,113.98 and 255.76

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Solution

The fourth proportional to 742.83, 1,113.98 and 255.76 is: 383.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.83 : 1,113.98 = 255.76 : x
  2. Step 2: Convert to fraction form
    742.83/1,113.98 = 255.76/x
  3. Step 3: Cross multiply
    742.83x = 1,113.98 × 255.76
  4. Step 4: Simplify right side
    742.83x = 284,911.52
  5. Step 5: Solve for x
    x = 284,911.52/742.83
  6. Step 6: Final answer
    x = 383.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.